Via Provinciale Anacapri is a narrow coastal road in Italy

Via Provinciale Anacapri is a short coastal road with a length of 2,4 km located in the island of Capri, in the Bay of Naples, south of the city of Naples and near the tip of the Amalfi Peninsula, in the Campania region of Southern Italy.

Large stretches should be taken at a snail's pace and a lookout kept for vehicles coming from the opposite direction! There are only two towns on the island, and this serpentine road leads from the harbor (Marina Grande) up to the mountain top town of Anacapri, the higher town. 
The road is so narrow that in some sections there are traffic lights because it’s impossible to pass 2 cars at the same time. Exercise extreme caution when passing on-coming traffic, over-taking and around corners. 

The road is winding, in some places only wide enough for one vehicle, and in many places bordered on one side by cliffs and on the other side by a drop of hundreds of meters (many hundreds of feet) over the Mediterranean sea. This narrow coastal road highs up along the steep cliffs where your knees will turn to jelly. Trust the driver and enjoy the spectacular views straight down to Capri's north coast and to Marina Grande. The surface of the road is asphalted.